DLPC3478: I2C input hysteresis?

鈴木辰雄

Part Number: DLPC3478
Other Parts Discussed in Thread: DLPC350

The data sheet states that the input of the I2C (e.g., IIC0_SCL) of the DLPC3478 is hysteresis.
However, its level is not prescribed.

The DLPC350 data sheet states VHYS(VT+ - VT-)=550mV.

What are the specifications of the DLPC3478?

9 months ago

0 Maximus Rusi 9 months ago

TI__Expert 5865 points

Hello,

We do not spec the hysteresis for this, VIH should be greater than or equal to .7*VCC_INTF and VIL should be less than or equal to .3*VCC_INTF in order to be within spec.

Best,

Maximus

0 鈴木辰雄 9 months ago in reply to Maximus Rusi

Prodigy 105 points

Thank you for answering.
VIH is 0.7*VCC_INTF(3.3V)=2.31V.
When shifting from L to H, the voltage exceeds 2.31V for about 3us due to overshoot, and then stabilizes at 2.1V.
Is there a possibility that this 2.1V can be detected as L level?

0 Maximus Rusi 9 months ago in reply to 鈴木辰雄

TI__Expert 5865 points

Hello,

We cannot guarantee the behavior if the signal is not stable above/below VIH/VIL. We recommend understanding why the signal drops below VIH and try to resolve from there.

Best,

Maximus

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DLPC3478: I2C input hysteresis?